I think I would take that with a pinch of salt, I don't think there is anything on these cars that can't be fixed, its just down to how much time you are willing to spend or how much you are willing to pay in labour costs to diagnose the problem. It is not uncommon for modern cars with complex electronics, canbus systems etc to have issues that can't be resolved by dealers but this is possibly down to software corruption or electronics that are beyond the capabilities of all but the biggest electronic geeks. Biturbos are actually quite simple, particularly the electrics as there are no complex systems just some wiring, a fusebox and some ECUs. Bearing in mind that the car was driven on the beach, I wouldn't mind betting that the problems are relating to water ingress into the electrics, the symptoms of misfiring, lack of power etc look to me as though they are fuelling and/or ignition related. Biturbos are renowned for their weak fuseboxes so I wouldn't mind betting that water has got into one of the ignition/fuelling systems and caused a short on the main fuse box. Most of the engine related relays are in the engine bay and with all that salty water splashing around in there it wouldn't have done them any good. All fairly easily traced and fixed in my opinion but that doesn't make quite such a dramatic story for tv